Adjustable to size and well made hat. I've been wearing it the most of all of my hats. The other day out in the field a horse fly buzzed me and took off. I guess that is proof of the insect repellant, eh?
Thanks, STP!

bought this for my sister in Florida to wear while walking her dog at night to keep away pesky gnats and skeeters. she has reporter that it does work. also bought one for my husband to wear on our trip to africa later this year. hope it works for him as well.